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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal

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J. Sens. Sens. Syst., 7, 289-297, 2018
https://doi.org/10.5194/jsss-7-289-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
16 Apr 2018
Combined resistive and thermoelectric oxygen sensor with almost temperature-independent characteristics
Murat Bektas, Thomas Stöcker, Angelika Mergner, Gunter Hagen, and Ralf Moos Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany
Abstract. The present study is focused in two directions. In the first part, BaFe(1 − x) − 0.01Al0.01TaxO3 − δ (BFATx) thick films with a Ta content between 0.1 and 0.4 were manufactured using the novel room temperature coating method aerosol deposition (ADM), and its material properties were characterized to find the best composition of BFATx for temperature-independent oxygen sensors. The material properties Seebeck coefficient and conductivity were determined between 600 and 800 °C at different oxygen partial pressures. BaFe0.69Al0.01Ta0.3O3 − δ (BFAT30) was found out to be very promising due to the almost temperature-independent behavior of both the conductivity and the Seebeck coefficient. In the second part of this study, films of BFAT30 were prepared on a special transducer that includes a heater, equipotential layers, and special electrode structures so that a combined direct thermoelectric/resistive oxygen sensor of BFAT30 with almost temperature-independent characteristics of both measurands, Seebeck coefficient and conductance could be realized. At high oxygen partial pressures (pO2 > 10−5 bar), the electrical conductance of the sensor shows an oxygen sensitivity of m  =  0.24 (with m being the slope in the logσ vs. logpO2 representation according to the behavior of σαpO2m), while the Seebeck coefficient changes with a slope of −38 µV K−1 per decade of pO2 at 700 °C. However, at low pO2 (pO2 < 10−14 bar) the conductance and the Seebeck coefficient change with pO2, with a slope of m  =  −0.23 and −21.2 µV K−1 per decade pO2, respectively.
Citation: Bektas, M., Stöcker, T., Mergner, A., Hagen, G., and Moos, R.: Combined resistive and thermoelectric oxygen sensor with almost temperature-independent characteristics, J. Sens. Sens. Syst., 7, 289-297, https://doi.org/10.5194/jsss-7-289-2018, 2018.

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We prepared BaFe(1-x)-0.01Al0.01TaxO3-δ (BFATx) thick films with x between 0.1 and 0.4 at room temperature using the aerosol deposition method and we measured Seebeck coefficients and conductivities between 600 and 800 °C at different oxygen concentrations. Deposited on a transducer that includes a heater, equipotential layers, and electrode structures, a dual thermoelectric–resistive oxygen sensor with almost temperature-independent characteristics of both measurands was realized using BFAT30.
We prepared BaFe(1-x)-0.01Al0.01TaxO3-δ (BFATx) thick films with x between 0.1 and 0.4 at room...
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